Letter-box transformation device

Details Letter-box transformation device Letter-box transformation device

1997-02-25

1998-05-19

Britton, Howard W.

Television

Format conversion

Conversion between standards with different aspect ratios

348913, H04N 101

Patent

active

057542430

ABSTRACT:
A read control circuit reads image data, which are stored in a decoding image memory, at a read speed m
times a display speed. These image data are written to line memories by a write control circuit. A read-address control circuit reads the image data from the line memories at a display speed, and line data for a letter-box image are generated by multipliers and an adder. Specifically, the line data of m lines which are read from the decoding image memory are transformed to n lines so that a letter-box display is made possible. Thus, letter-box transformation processing is performed with less memory capacity without the use of a field memory.

REFERENCES:
patent: 5642169 (1997-06-01), Yamamoto
patent: 5688820 (1997-11-01), Naka

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